#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;
 
#include<bits/stdc++.h>
using namespace std;
 
int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  
  ll h,w,la,lb,ka,kb;
  cin>>h>>w>>la>>lb>>ka>>kb;
  
  auto f=[&](ll n)->bool{
    ll ma=0;
    for(ll a=0;a<=n;a++){
      ll b=n-a;
      ma=max(ma,min(a*la,h)*min(b*lb,w)+a*ka+b*kb);
    }
    if(ma>=h*w) return true;
    return false;
  };
  
  ll ok=h+w,ng=0;
  while(ok-ng>1){
    ll mid=(ok+ng)/2;
    if(f(mid)) ok=mid;
    else ng=mid;
  }
  cout<<ok<<endl;
    
  return 0;
}